Only if safety means a way to guarantee the uniqueness of a row (no duplicate rows).
The examples shows the different ways to do that, either using PK (always Unique but can be Clustered or non-clustered) or creating indexes with Unique Constraints (can be also Clustered or non-clustered).
Remember that you can only have one clustered index by table because it's the index that says how your records will be physically ordered.

JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.

Viewers will learn how to use the UPDATE and DELETE statements to change or remove existing data from their tables.
Make a table:
Update a specific column given a specific row using the UPDATE statement:
Remove a set of values using the DELETE s…